Cable clamp



April 27', 1926. I 1,582,340 y`N. G. Ml LN E `CABLE CLAMP Filed Dec. 16,1925 7 137% fig f f@ E {f} r l I l Il l Il /L I wa R y1,

MMM

Fettented Apr. 27, 1926.

letzen unirse STATES, PATENT orsi-ee.

"WINFORD GLADSTONEIILNE, 0E HAMELTON, OTTABO, CANADA, ASSIGNR TO THE N.SLATER COMEANY, LIMITED, OF HAMILTON, CANADA.

y CABLE Application, filed December To all whom it muy conform.'

Be it known that l, ViliNroiin Ginns'ronn Minne. :i subieet ot the Kingof Greet' Brituin und u resident of the city ot l'luiniiton, in thecounty ot' lYentworth, Province ot Ontario, loininion ot' Canards, haveinvente ed certain neuv undY useful Improvements in. Cable @lumps7 otwhich the tfolloniingy is u specitieution. Y

ltly invention relutes to improvements in crible elsinpsend the objectotthe. invention is to provide an improved torni ot Clfnnp which willprovide un extremely secure und efficient grip Vupon the crible and inYwhichA the eoinprssion upon the cable Will be uniiorinly distributed undwill ber more truly redini thus eliniiinitirigl inore perfectly` thetendency to distort or crushthe' cable out of its norinel torni; aiJfurther object is to distribute the compression upon the enbleironiininiinuni :it the inoutlji of the cle-nip Where the tension in thecae-ble is a. marginiuin to a innxiinuni u, point Where the tensiony inthe cable is u mininiuin, e

Other objects will appear in the course. ot the following specification.y

lily intention consists in the constructionv and arrangement of parteiall es hereinafter more porticulery described und illustrated in theeccoinpenying drewingsin Whichz-A lfliej. l; is e side View of. aCuble-olunip ein`T` bodyinginy improved construction showing 'tiropoi-'tions of cable connected thereby;

Fig. 2 is u transverse sectionv (to Ln elilarge d seule) taken on the.lines. 2-2 of Figs. l und 3. n n A lfig. 21 is n. central longitudinulsection through l? 'i the section beine` on the line' Sl oi Fig.

In the drawings like elisrecters. of referenre indicate Corresponding`parts in ,the various views. l v

ln the torni illustrated, niy invention coin sis-ts ot' u cable clninpcomprisingv it bottoni plete i the central portion of which is de-yelunjip urefindicuted by the nuineruls 5 5` and the portions oi thecrible Within the elan'ipere enclosed by u nretullic piece G.v

Opposed side plates 7 ero-.operate With'the bottoni plate andtheiroiiterlateral extrein CLAMP. 16, 1925. serial in. 75366.

ities rest tieelyupon the bottoni plate it 8.

The inner lateral extremities of the side putes 7 nre et trenntesliupeat 9 und the inner conceive portions of these A(trennte portions engagethe periphery oit the piece G.

A. keper plate l() is mounted ebove the side plates 7 endflnifs, formedcentrally in its under face :t recessli extendinglongitud'inally thereofi i they are spaced spurt longitudinally of the clamp. i

This longitudinal spec-ing of the bolts diminishes troni u inexiniuin etthe mouth of the cle-nip et t to aiininin'iuin at Z) adjacent to theinner end ot the cable, the purpose ot which, will be explained hereinifer. t Y

The construction ac-ndQperution of viny iin` proredolainp islas followszy The. end portions ot each cable 5 to be giipljied'nwithin theeiznnpinuy be enclosed by n strip 6 and for purposesl of descriptionthis strip muy be` considered as part of thel cable. Y

The U-bolts are pessed upwardly through the orifices lllinthebottoin-plate 1 sothut the arms of each bolt lie on oppositesidesot' the depression 8. ,n

The cable ends are then plueet'liwithin the depression 8 und the opposedside plates 7' are placed in position with the bolts "extend-r inethrough the orifices l5.

The side plates lie in en inclined position With their outer edgesresting freely upon the bottoni plete et, 8 and their inner arcuateportions 9 resting upon portions of the periphery of the cable. f

The keeper plate 10 is theninounted` so that the bolt arms pass throughthe orilices 16 therein.

The keeper plete takes a position with the upperfends otheercuateportions 9 lyingv Within the recess 1l in the under fece ofthe keeperplate and the side edges of this recess make line contact with theconvex surfaces of the arcuate portions 9 at 12 weich line of cont-actis intermediately of the length of said arcs.

F rom an examination of Fig. 2 it will be noted that the arcuateportions 9 of the opposed side plates 7 are spaced apart to provide agap c l therebetween and due to the l inclined position of the sideplates gaps are provided at (l between the side plates and the bottomplate.

ln tightening down the nuts 1T the first action is to close the opposedside plates down against the bottom plate at 8 `due to the coetiicientof friction at 12. Line contacts are thus made at 8 and 12 and surfacecontacts of the concave faces of the arcuate portions 9 of the peripheryof the strips G which is the same as with the cable. This leaves gaps atc and d.

ln this way the cable is gripped between the arcuate portions 9 andthedepressed portion 3 of the bottom plate.

During further tightening of the nuts 17 the contacts at 12 are fixedexcept as regards slidingoutwardly upon the flat surface of the bottomplate 1 so that during this further tightening the contacts 12 slidedownwardly oven the convex surfaces of the arcuate portions 9 and theside plates 7 close radially inward upon the cable reducing the gaps ato and d.

Since the orifices 15 in the Vside plates 7 are of somewhat greaterdiameter than the bolts 13 these side plates have suiiicient freedom ofmovment upon the bolts to permit this free movement as described.

By so constructing the parts that the straight line joining the centerof the bolt hole at the upper face of the keeper plate to the center ofthe cable passes approximately through the contact 12, the keeper plateis practically relieved of ben-ding moment tending to bow the sidesthereof downwardly.

ln actual test the keeper plate bent upwardly at the sides instead ofdownwardly would be expected. Y

ln my improved clamp it will thus be seen that practically a trulyradial compression is placed upon the cable so that there is not theusual tendency to flatten or distort the cable out of its normal roundshape as is ordinarily the case when the com aression is in a transversedirection.

lt is desirable in clamps used on cables carrying tension andparticularly in cables made of aluminum that the product of the tensileand compressive load be kept below the flow point of the cable.

Referring now to Fig. 3 the tensile load in the cable at E is 190% or amaximum, while the tensile load in the cable at Z) is zero or a minimum.

lt is therefore desirable that the compression in the cable caused bythe clamp be a minimum at the mouth of the clamp and that it graduallyincreases to a maximum at ab.

This may be accomplished by gradually decreasing the bolt spacing from ato b so that as the tension in the cable decreases the compressionincreases so that the combined product of the tension by compression iskept below the flow point of the cable material and the compression inthe cable at the mouth of the clamp is kept at a minimum value which isdesirable.

From the foregoing it will be apparent that l have devised valuableimprovements in cable clamps of the class described whereby the objectsof my invention have been attained.

Various modifications may be 'made in my invention without departingfrom the spirit thereof or scope of the claims and therefore the exactforms shown are to be taken as illustrative only and not in a limitingsense and I desire that only such limitations shall be placed thereon asare imposed by the prior art or are specifically set forth in theappended claims.

What l claim as my invention is:

1. In a cable clamp of the class described, the combination with acable, of a clamp therefor comprising, a bottom plate the centralportion of which is depressed to form a longitudinal cable receiving`depression, a keeper plate above the bottom plate and cable, opposedside plates interposed between the bottom plate and keeper plate andeach formed with an arcuate portion engaging a portion of the cableperiphery, and means co-acting between the bottom plate and keeper platefor forcing the side plates towards the bottom plate to grip the cablebetween the bottom plate and the arcuate portions of the side plates.

2. In a cable clamp of the class described, the combination with acable, of a clamp therefor comprising, a bottom plate the ccntralportion of which is depressed to form a longitudinal cable receivingdepression, a keeper plate above the bottom pla-te and cable, opposedside plates interposed between the bottom plate and keeper plate andeach formed with an arcuate portion engaging a portion of the cableperiphery, and means co-acting between the bottom plate and keeper platefor forcing the side plates towards the bottom plate and towards eachother to grip the cable between the bottom plate and the arcuateportions of the side plates.

3. In a cable clamp of the class described, the combination with acable, of a clamp therefor comprising, a bottom plate the centralportion of which is depressed to form a longitudinal cable receivingdepression,

opposed side plates, the outer lateral extreinities of which rest uponthe bottom plate and the inner lateral extremities of which are gagingthe under face of said depressed-porfl t) tion of the bottoni plate, andnuts on the extremities of the bolt arms andengaging the upper face ofsaid keeper plate.

el. In a cable clamp of the class described, the combination with thecable, of a clamp therefor comprising, a bottom plate the centralportion of which is depressed to Vform a longitudinal cable receivingdepression, 0pposed side plates the outer lateral extremities of whichfreely rest upon the bottom plate and the inner lateral extremities ofwhich are of arcuate shape and are spaced apart, the concave surfaces ofsaid arcuate portions engaging portions of the periphery of the cable, akeeper plate, said keeper plate having line contact with the convexsurfaces of said arcuate portions, a U-bolt, the arms of which extendupwardly on either side of the cable through orifices in the bottomplate,

side plates and keeper plate, the orifices in the side plates being ofsomewhat greater diameter than the U-bolt whereby the side plates have acertain freedom of movement upon said bolt, the central branch of saidU-bolt engaging the under face of said depressed portion of the bottomplate, and nuts on the extremities of the bolt arms and engaging theupper face of said keeper plate.

5. In a cable clamp of the class described, the combination with acable, of a clamp therefor comprising, a bottom plate the centralportion of which is depressed to form a longitudinal cable receivingdepression, opposed side plates the outer lateral extremities of whichfreely rest upon the bottom plate vand the inner lateral extremities ofwhich are of arcuate'shape andare spaced apart, the concave surfaces ofsaid arcuate portions engaging portions of the periphery of the cable, akeeper plate having a central longitudiiial recess in its under side,the edges of.

greater diameter than the U-bolt wherebyk the side plates' have acertain freedom of movement upon said bolt, the central branch of saidU-bolt engaging the under face of vSaid depressed portion of the bottomplate,

andnuts on the extremities of the bolt arms and engaging the upper faceof the keeper plate.

6. In a cable clamp of the class described, the combination with acable, of, a clamp therefor comprising, a bcttonrplate, the eentralportion of which is depressed to` forni a. longitudinal cable receiving'depression, opposed side plates, the outer lateral leatremities of whichfreelyy rest upon the bottom plate and theinner lateral extren'ii*tiesof which are of arcuate shape and are spaced'apart', the concavesurfaces of lsaid larcuate portions engaging portions ofthe periphery ofthe cable, a keeper plate, said keeperplate having line contact with theconvex surfaces of said arcuate portions intermediately thereof, aU-bolt the arms of which extend upwardly on either side of the cablethrough orifices in the bottom plate, side plates-and keeper plate, theoriii'ces in the side plates being of somewhat greater diameter than theU-bolt whereby the side plates have a certain freedom of movement uponsaid bolt, the central branch of the U-bolt engaging the under face ofthe depressed portion of the bottom plate,

and nuts on the extremities of the bolt arms and engaging the upper faceof the keeper yplate,the parts so formed that a straight line joiningthe center of the bolt at the upper face of the keeper plate and thecenter Vof the cable approximately passes through the point of contactof the keeper plate with the arcuate portion of the corresponding sideplate.

7. In aV cable clamp of the class described, the combination with acable, of a clamp therefor cOinpiiiSing, a bot-tom plate the centralportion' of which is depressed to form a longitudinal cable receivingdepression, and the sides of which are bent to form longitudinalstiffening ribs, opposed `side kplates the outer lateral extremities ofwhich freely rest upon the bottom plate and the inner lateralextremities of wliili are of arcuate shape and are spaced apart, theconcave surfaces of said arcuate portions engaging portions Vof theperiphery ofthe cable, a keeper plate having a central longitudinalrecess in its under side, the edges of said recess having line contactwith the convex surfaces of said arcuate portions of the side platesintermediately thereof, a U-bolt, the arms of which extend upwardly oneither side of the cable through orifices in the bottom plate, sideplates and keeper plate, the orifices in the side plates being ofsomewhat greaterk diameter than the U-bolt wherebyv the side plates havea certain freellt) ies

dom of movement upon said bolt, the cent-ralr branch of'said U-boltengaging the under face 'of said depressedportion of the bottom plate,and nuts on the extremities of the iso bolt arnis and engaging the upperface of 'he keeper plate.

8. In a Cable elzunp of the oli-iss described, they combination wi'h aGoble of n clamp therefor eon'iprisinpg, u bottoni plate the centralportion of which is depressed Co forni :i longitudinal cable receivingdepression, opposed sine plaies, ihe outer lateral exireiniiies or whieurest upon the boton'i plate und the inner lateral extremities of whichare of arcuateshnpe, the concave surfaces of Suid arcuate portionsengaging portions of 'the peripherj,v7 of the euble, u keeper plate,said keeper plate having line Contact with the convex surfaces of saidarcuate portions, a plurality o'l' longi'itudiinill57 spaced apartij-bolts, the arms or r-:liieh ext @il ufzrrdly on either side of thecable tluough oriloes in lie bottoni pluie, side plates and keeperplate, the eenrrel branches of seid U-bolts engaging the under face ofsaid depressed portion of he botioin plate, the longitudinal Spacing ofthe bolts gradually ("liniinishing measured inwardly Yfrom the mouth ofthe clamp.

VVINFORD GLADSTONE MILNE.

